I always let mine rest pointy end downwards for 24 hours (but it should be at least 12), so don't worry. let the first batch sit until the last batch has sat for at least 12 hours (to let the embryo, air cell etc. settle)

I would just hold out on the first arrivals to let everyone set in together. Depending upon your set-up, staggered hatches can produce some very challenging conditions. For those shipped eggies, I'd want to give them all the advantaged possible. Good luck and happy hatching!